Nitric acid turns poplar a reddish nut-brown, similar to air-dried walnut when you apply an oil finish. And yes, it looks antique. You can purchase laboratory-grade 70% nitric acid (HNO3) in various quantities over the Internet from Art Chemicals. See http://www.artchemicals.com/ProductDetails.asp?ProductCode=807020834&CartID=0&gclid=COyQ8JjQ2JwCFdxD5god0VvBKg . Before using it, I suggest diluting it 1:6 with distilled water to make a 10% solution. Remember your high school chemistry training for diluting acid: "Add the the acid to the wata like you oughta." Adding water to acid can cause a dangerous reaction.

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